tephigramn.
/ˈtɛfɪɡram/ Meteorology.
A diagram in which one axis represents temperature and another potential temperature (as a measure of entropy), used to represent the thermodynamic state of the atmosphere at different heights.
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tephigram1929
c1925 W. N. Shaw Sel. Meteorol. Papers (1955) 226/2 I have found the representation known to engineers as a θ, ϕ (temperature-entropy) diagram (or, as I shall call it here, a t ϕ diagram) has the advantage of being..more expressive than the direct pressure-temperature diagram.]
1929 W. J. Humphreys Physics of Air (ed. 2) xv. 259 Tephigram... It is convenient, as developed by Sir Napier Shaw and his colleagues, to plot values on a temperature-entropy diagram.
1929 W. J. Humphreys Physics of Air (ed. 2) xv. 261 Figure 77 is a tephigram..of a balloon sounding.
1938 Nature 29 Oct. 804/1 Daily tephigrams based on aeroplane soundings constitute the most valuable items in forecasting..clearing or persistence of cloud.
1969 Nature 11 Oct. 170/1 The uniformity of weather conditions over the region in question justified our taking these tephigrams as representative of the state of the atmosphere over the area.
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).
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n.1929